Concrete placing apparatus



June 27, 1939.

0. JACKSON CONCRETE PLACING APPARATUS Filed Jan. 22, 1936 5 Sheets-Sheet 1 INVENTOR. T5 Comm 1' Jackson M E1 ATTORNEYS June 27, 1939.

c. JACKSON CONCRETE PLACING APPARATUS Fil-ed Jan. 22', 1936 5 Sheets-heet 2 INVENTOR. Corwi ll Jackson ATTORNEYS June 27, 1939.

5 Sheets-Sheet 3 Filed Jan. 22, 1936 \wv v w\ w m s 7 mm H T MM m v- Q Mu Mm P .w H H j d O C 5 @H 0 MN 2 YM MN 8 B wmwl a IIIIIIINM, I om w h w r I. mu 2 m H 3 m H June 27, 1939. c. JACKSON CONCRETE PLACING APPARATUS Filed Jan. 22, 1936 5 Sheets-Sheet 4 icj INVENTOR. Co'rwill Jackson BY 4% M gun/744 9 6 ATTORNEYS June 27, 1939. c. JACKSON 2,163,882

CONCRETE I PLACING APPARATUS Filed Jan 22, 1936 5 Sheets-Sheet 5 INVENTOR. .7 corwm Jackson a 6 2 JTMM ATTORNEY 5 Patented June 27, 1939 UNITED sTA'rEs PATENT OFFICE -3fifif.i'ifii.fl?tffi Application January 22, 1938. Serial No. 60,237

10 Claims.

This invention relates to improvements in con- 15 which is simple and economical in structure and at the same time strong and durable. Objects relating to details andveconomies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which:

Fig. 1 is a side elevation of a machine embodying the features of my invention illustrated in operative relation to a tractor and finishing screed, the various parts being conventionally shown for convenience in illustration.

Fig. 2 is a fragmentary plan view with parts a sectioned and broken away for convenience in illustration.

Fig. 3 is an enlarged fragmentary view partially in section on line 33 of Figs. 2 and 6.

Fig. 4 is an enlarged fragmentary end view, the

35 parts being shown in one position by full lines and in another position by dotted lines.

Fig. 5 is an enlarged detail view partially in section online 5-5 of Figs. 2 and 4.

Fig. 6 is a vertical section on line 66 of Figs.

40 2 and 3- Fig. 7 is a section through the vibratory member on line 'I'l of Figs. 2 and 5.

Fig. 8 is a section through the vibratory member on line 8--8 of Fig. 3.

Fig. 9 is a fragmentary front elevation or elevation looking from the right of Fig. 10 of a modified form or embodiment of my invention.

Fig. 10 is a vertical section of'the parts shown in Fig. 9 on line Ill-l thereof.

50 In the accompanying drawings, I represents one of the forms of the concrete pavement or' slab, these forms being adapted as a track for the concrete placing machine and also for its propelling tractor designated generally by the nu to meral 2.

My concrete placing or working machine in the embodiment illustrated comprisesa frame 3 having depending standards 4 at the ends thereof, carrying wheels being mounted by the supporting arms or bars 6 pivoted at I on these stand- 5 ards so that by raising and lowering the ends 8 of the arms, the frame 3 and its standards 4 are raised and lowered.

The means for adjusting and supporting the arms 8 in their adjusted positions, in the embodiment illustrated, comprises cables ii connected to the ends 8 of the arms and passed over suitable guiding pulleys l0 and II on the frame 3 to the cable extension l2 which is in turn connected to a drum I3 provided with a ratchet wheel H, the drum being actuated or adjusted by the ratchet lever l5. With this arrangement, the arms are swung on their pivots to raise or lower the frame'and this raises or lowers the vibratory or screed element It. 2

This vibratory element is, in the embodiment illustrated, of tubular cylindrical form and is provided with an upwardly projecting longiudinal top plate I! and with forwardly diverging end wings I8 designed to draw the material to be treated into the vibratory member and prevent its flowing around the ends of the same. This vibratory member is supported to permit vibratory movement, the supporting means preferably being such as to permit vibratory moveso ment in an orbital path.

In the mounting best shown in Fig. 5, the vibratory member is mounted at its ends upon the standards 4, the standards being provided with inwardly projecting journal-like studs i9 v carrying the resilient disk cushioning members 28. These cushioning members are arranged in holders 2i provided therefor at the ends of the vibratory member, the studs being flanged at 22, the disk being retained between this flange and 40 the collar 23 on the studs. The holders are seated within and fixedly secured to the ends of the vibratory members. This'provides supports for the vibratory member which permits its being vibrated at high frequency and supports it so that it may be urged against a mass of concrete to be placed.

The means for vibrating the vibratory member in the embodiments illustrated comprises a shaft or rotor 24 disposed longitudinally within the tubular vibratory member and supported therein by means of spaced bearings 25 fitting within the walls of the vibratory member. The shaft is preferably a sectional shaft for convenience in assembling. The shaft is provided with unbalancing weights 26 so that when the shaft is rotated, vibratory impulses are imparted to the vibratory member. The rotor is driven from an engine or motor 21 mounted on the carriage 3.

A boot or transmission housing 28 is mounted on the vibratory member and is supported in upright position by means of cushioned brackets 28-see Fig. 2. A driving shaft 30 is supported at one end in the bearing Iii carried by this housing and by a bearing 32 on the carriage frame, a resilient flexible vibration absorbing section 33 being provided between the bearings so that the vibrations of the vibratory member are not imparted to the frame or to the engine.

n the end of the shaft til I mount a pulley 36 having a double groove for the V-belts 35, the shaft or rotor 26! having a suitable pulley 35 coacting with these belts. A belt tightening pulley 31 is provided for the belts 35, this belt tightening pulley taking the whip or minimizing the whip of the belts which might result from the vibration.

The bearing members 25 are secured in position within the vibratory member by means of the set screws 38 which have tapered tips 3% engaging bores Ml provided therefor in the members 25.

Where it is desired to further smooth the surface of the concrete, I provide a screed ii which may be pushed along on the forms i by means of the abutment lZ-see Fig. 1. The vibrator carriage is provided with a push bar i3 adapted for attachment at M to the tractor 2.

In the embodiment of 'my invention shown in Figs. 9 and 10, the frame 50 corresponding to the frame 3 of the previously described embodiments is provided with standards on which the wheel supporting arms 52 are mounted, the carrying wheels 53 being mounted on these arms and designed to travel on the forms I which constitute tracks or rails. The supporting arms 52 are adjusted through cabl s 9. The vibratory member 54 is preferably cylindrical and provided with an upwardly projecting longitudinal web or top plate H.

The vibrating means is preferably that illustrated in the previously described embodiments, housed within the vibratory member, comprising a rotor or shaft 24 having an unbalancing weight 26 thereon. The vibratory member is resiliently suspended by means of the strap hangers 55 arranged in opposed upwardly diverging pairs at the ends of the vibratory member, the vibratory member being provided with upwardly projecting ears E55 having holes 51 therein receiving the hangers.

The frame is provided with ears 58 receiving the upper ends of the straps. By arranging these hanger straps in downwardly diverging pairs, they tend to centralize or support the vibratory member in a central position while permitting free orbital vibration thereof. To propel the vibratory member against and over the mass of concrete being treated, the frame is provided with depending arms 59 having resilient buffers 60 engaging the vibratory member as shown in Fig. 10.

The flexible hangers are preferably attached to the vibratory member above the longitudinal center thereof or the axis of the shaft carrying the unbalancing weights 26. This flexible means of suspension is found to effectively eliminate any nodes or dead spots in the vibratory member. Assuming that the vibratory member is twenty feet long, the hangers are preferably arranged amasaa about flve feet from the ends of the vibratory member.

The embodiment of Figs. 9 and has some advantage over that shown in previously described embodiments particularly in that the vibratory member has a somewhat greater amplitude of movement and, as stated, there are no nodes or dead spots and is uniformly vibrated throughout its length. It is preferably provided at its ends with the wings 62.

In the commercial embodiment which I have found very practical, the vibratory screed member is six inches in diameter and twenty feet in length. Its length of course would be varied according to the spacing of the forms and this is governed by the pavement or slabs to be laid.

In both forms of mounting illustrated, the vibratory member is resiliently or flexibly supported to permit effective vibration thereof.

The machine is especially designed by me for the practice of my Patent No. 1,787,449, dated January 6, 1931. It is, however, adapted for placing concrete varying widely in moisture contents and in aggregate. The structure is quite economical but at the same time the machine is of large capacity and capable of many usesthat is, it may be used in placing concrete pavements, bridge decks, in walls for water conduits or canals and the like.

I have illustrated and described my improvements in an embodiment which I have found very practical. I have not attempted to illustrate or describe other embodiments or adaptations as it is believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a machine of the class described, the combination of a carrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotally mounted on said standards, a cylindrical vibratory element disposed horizontally between said standards and provided with a vertically disposed top plate and with forwardly projecting wings at its ends, means for mounting said vibratory element to permit vibratory movement thereof, a shaft disposed longitudinally within said vibratory member and provided with unbalancing weights, a centrally disposed transmission housing projecting upwardly from said vibratory element and opening thereto, cushioned means for supporting said housing in upright position, a motor mounted on said carrying frame and provided with a driving shaft supported at one end by said housing and having a flexible vibration absorbing section between the housing and the motor, driving connections for said driving shaft to said vibrating shaft arranged in said housing, and means for adjustably supporting said wheel supporting arms.

2. In a machine of the class described, the combination of a carrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotally mounted on said standards, a tubular vibratory element disposed horizontally between said standards, means for mounting said vibratory element to permit vibrating movement thereof, a shaft disposed longitudinally within said vibratory member'and provided with unbalancing weights, a centrally disposed transmission housing projecting upwardly from said vibratory element and opening thereto, cushioned means for supporting said housing in upright position, a motor mounted on said carrying frame and provided with a driving shaft supported at one end by said housing and having a flexible vibration absorbing section between the housing and the motor, driving connections for said driving shaft to said vibrating shaft arranged in said housing, and means for adjustably supporting said wheel supporting arms.

3. In a machine of the class described, the combination of a carrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotally mounted on said standards, a tubular vibratory element disposed horizontally between said standards, means for mounting said vibratory element to permit vibratory movement thereof, a shaft disposed longitudinally within said vibratory member and provided with'unbalancing weights, a centrally disposed transmission housing projecting upwardly from said vibratory element and opening thereto, cushioned means for supporting said housing in upright position, a motor mounted on said carrying frame and provided with a driving shaft supported at one end by said housing and having a flexible vibration absorbing section between the housing and the motor, driving connections for said driving shaft to said vibrating shaft arranged in said housing, and means for adjustably supporting said wheel supporting arms including an adjusting lever and cables connecting said lever to said wheel supporting arms, said cables being provided with guide pulleys whereby the arms are simultaneously adjusted for raising and lowering said vibratory element. 4. In a machine of the class described, the combination of a carrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotaily mounted on said standards, a tubular vibratory element disposed horizontally between said standards and provided with a vertically disposed top plate and with forwardly projecting wings at its ends, means for mounting said vibratory element on said frame to permit vibratory movement thereof, a vibrating means for said vibratory element comprising a shaft disposed longitudinally within said vibratory member and provided with unbalancing weights, and means for adjustably supporting said wheel supporting arms.

5. In a machine of the class described, the combination of a c rrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotally mounted on said standards, a tubular vibratory element disposed horizontally between said standards.

means; for mounting said vibratory element on said carrying frame to permit vibratory move- 00 ment thereof, a vibrating means for said vibratudinaily within said vibratory member and provided with unbalancing weights, and means for adjustably supporting said wheel supporting arms whereby said frame and said vibrating element may be vertically adjusted.

6. In a machine of the class described, the combination of a carrying frame provided with depending standards, carrying wheels, supporting arms for said carrying wheels pivotaily mounted on said standards, a tubular vibratory element disposed horizontally between said standards, means for mounting said vibratory element to permit vibratory movement thereof, a vibrating means for said vibratory element comprising a shaft disposed longitudinally within said vibratory member and provided with unbalancing weights, and means for adjustably supporting said wheel supporting arms including an adjusting lever and cables connecting said lever to said wheel supporting arms, said cables being provided with guide pulleys whereby the arms are simultaneously adjusted for raising and lowering said vibratory element.

'7. In a machine of the class described, the combination of a wheeled carriage mounted for vertical adjustment on its wheels, a horizontally disposed vibratory element disposed transversely I of the path of travel of the carriage and mounted on said carriage for vertical adjustment therewith and to permit vibratory movement in an orbital path, and means for vibrating said vibratory element carried thereby.

8. In a machine of the class described, the combination with a carrying frame, of an elongated cylindrical tubular horizontally disposed vibratory element, pairs of flexible non-extensible hanger straps on said frame secured to said vibratory element, means for vibrating said vibratory element including an unbalanced rotor within said vibratory element, and a thrust member for said vibratory element.

9. In a machine of the class described, the combination with a carrying frame, of an elongated cylindrical tubular horizontally disposed vibratory element, pairs of downwardly converging flexible non-extensible hanger straps on said frame secured to said vibratory element in a plane substantially above its axis, means for vibrating said vibratory element including an unbalanced rotor within said vibratory element, and a cushioned thrust member engaging said vibratory element.

10. In a machine of the class described, the combination with a carrying frame, of an elongated horizontally disposed vibratory element, pairs of downwardly converging flexible nonextensible hanger straps on said frame secured to ,said vibratory element, means for vibrating said 

